Reznor YDSA Operation Manual - Manual (Page 13)

Form O-Y P/N 273647R1, Page 13
Optional Modulating
Reheat (Low Enthalpy
Option RPLE or High
Enthalpy Option
RPHE)
Function: Units equipped with optional reheat have a dedicated refrigerant system
(DH circuit) that precools the incoming air then directly uses the condenser waste
heat to reheat the air after it passes through the DX cooling coil. The reheat system
precooling evaporator coil is upstream of the main evaporator coil and the reheat
condenser coil is downstream. The upstream "precool" coil tempers outside air and
lowers the wet bulb depression of the air entering the main evaporator coil. The heat
removed at the precool coil is rejected to the downstream "reheat" coil.
Operation of the DH circuit is controlled by the digital controller in the electrical
compartment. See FIGURE 1(shown on page 4) and Figures 13 and 14 (shown on
pages 13 & 14). The digital controller interfaces with the system controller and pro-
vides protection and diagnostics for compressor operation.
Service: See Troubleshooting Chart in Paragraph 7.2 on page 45 for identification of
alarm codes. Use only factory-authorized replacement parts.
FIGURE 12 - Cooling
Circuits - Models
YDHA and YDMA
Sizes 300 and 360
Circuit A
Circuit B
Equilizer Tube
Filter Drier
Evaporator Coil
View from Cooling Cabinet Door
(Evaporator Coil Side)
TXV
Valves
View from Compressor and
Condenser Section
Circuit B
Compressor
(Circuit B)
Circuit B
Condenser Coil
Circuit B
Condenser Coil Circuit
A
Filter Drier
Compressor
(Circuit A)
Filter Drier
Circuit A
Circuit A
Circuit A
Circuit B
Model YDHA 300 and 360 (Cabinet 3)
Model YDMA 300 and 360 (Cabinet 3)
FIGURE 13 - Optional
DH Circuit (Option
RPLE Low Enthalpy
Reheat Pump or
Option RPHE High
Enthalpy Reheat Pump
Model YDHA 060, 090, 120, and 150 (Cabinet 1)
Model YDMA 060, 090, 120, and 150 (Cabinet 1)
Model YDSA 120 and 150 (Cabinet 2)
Model YDHA 180, 210, and 240 (Cabinet 2)
Model YDMA 180, 210, and 240 (Cabinet 2)
DH
Coil
Condenser Coil
Circuit A
Condenser Coil
Circuit B
View from Compressor and
Condenser Section
Modulating
Compressor
(Optinal DH Circuit)
Solenoid
Valve
View from Cooling Cabinet Door
(Evaporator Coil Side)
Equalizer
Tube
Filter
Drier
TXV Valve
Circuit DH
DH
Coil